I really like the idea of getting the Sack of Pet Supplies as a quest reward, but when I opened it, all it contained was a pet leash. I was very disappointed.

So, I was thinking, there should be more fun stuff in these bags. Like, maybe something that might heal them during a wild pet battle, something that might buff them, or something that might create any number of other silly effect (make the pet bigger, a different colour, fall in love with a critter, etc). Maybe changing their colour could even be permanent? (like, for instance, how some Small Frogs are green and others are orange and purple).